One-Dimensional Numerical Model for Nonuniform Sediment Transport under Unsteady Flows in Channel Networks
Publication: Journal of Hydraulic Engineering
Volume 130, Issue 9
Abstract
In this study, the proposed one-dimensional model simulates the nonequilibrium transport of nonuniform total load under unsteady flow conditions in dendritic channel networks with hydraulic structures. The equations of sediment transport, bed changes, and bed-material sorting are solved in a coupling procedure with a direct solution technique, while still decoupled from the flow model. This coupled model for sediment calculation is more stable and less likely to produce negative values for bed-material gradation than the traditional fully decoupled model. The sediment transport capacity is calculated by one of four formulas, which have taken into consideration the hiding and exposure mechanism of nonuniform sediment transport. The fluvial erosion at bank toes and the mass failure of banks are simulated to complement the modeling of bed morphological changes in channels. The tests in several cases show that the present model is capable of predicting sediment transport, bed changes, and bed-material sorting in various situations, with reasonable accuracy and reliability.
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Information
Published In
Journal of Hydraulic Engineering
Volume 130 • Issue 9 • September 2004
Pages: 914 - 923
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Dec 17, 2002
Accepted: Mar 26, 2004
Published online: Aug 16, 2004
Published in print: Sep 2004
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